That looks like a Strictum if ever I saw one. Gorgeous bloom!

This most definitely not strictum. This looks to be a hybrid of Epiphyllum oxypetalum. It is not oxypetalum, but is so similar to it that I think this is one of the rare hybrids from it. In the US I am considered one of the experts on Epiphyllums so you can feel confident in my analysis.

Jim Hunter

Here is a link that might be useful: GotEpis.com